Organization	12 Months Ended
Dec. 31, 2015
Organization [Abstract]
Organization	Note 1 - Organization AmBase Corporation ("AmBase" or the "Company") is a holding company which has an equity investment in a real estate development property to develop real property in New York, New York and owns a commercial office building in Greenwich, Connecticut that is managed and operated by the Company. The Company's assets currently consist primarily of cash and cash equivalents, an equity investment in a real estate development property and real estate owned. The Company earns non-operating revenue consisting principally of investment earnings on cash equivalents. As further discussed in Note 5, the Company owns an equity interest in a real estate development property through a joint venture agreement to purchase and develop real property located at 105 through 111 West 57^th Street in New York, New York (the "111 West 57^th Property"). The Company continues to evaluate a number of possible acquisitions and is engaged in the management of its assets and liabilities. The Company has incurred operating losses and used cash for operating activities for the past several years. The Company has also made significant investments in the 111 West 57^th Street Property since 2013. The Company has continued to keep operating expenses at a reduced level. However, there can be no assurance that the Company's current level of operating expenses will not increase or that other uses of cash will not be necessary. The Company believes that based on its current level of operating expenses, its existing cash and cash equivalents will be sufficient to fund operating activities through at least the next twelve months from the financial statement isssuance date. The Company's management expects that operating cash needs in 2016 will be met principally by the Company's current financial resources. Nonetheless, over the next several months, the Company will seek to manage its current level of cash and cash equivalents, through various sources, including but not limited to, reducing operating expenses, possible asset sales and/or long term borrowings, although this cannot be assured.

Note 1 - Organization

AmBase Corporation ("AmBase" or the "Company") is a holding company which has an equity investment in a real estate development property to develop real property in New York, New York and owns a commercial office building in Greenwich, Connecticut that is managed and operated by the Company.

The Company's assets currently consist primarily of cash and cash equivalents, an equity investment in a real estate development property and real estate owned. The Company earns non-operating revenue consisting principally of investment earnings on cash equivalents. As further discussed in Note 5, the Company owns an equity interest in a real estate development property through a joint venture agreement to purchase and develop real property located at 105 through 111 West 57^th Street in New York, New York (the "111 West 57^th Property"). The Company continues to evaluate a number of possible acquisitions and is engaged in the management of its assets and liabilities.

The Company has incurred operating losses and used cash for operating activities for the past several years. The Company has also made significant investments in the 111 West 57^th Street Property since 2013. The Company has continued to keep operating expenses at a reduced level. However, there can be no assurance that the Company's current level of operating expenses will not increase or that other uses of cash will not be necessary. The Company believes that based on its current level of operating expenses, its existing cash and cash equivalents will be sufficient to fund operating activities through at least the next twelve months from the financial statement isssuance date. The Company's management expects that operating cash needs in 2016 will be met principally by the Company's current financial resources. Nonetheless, over the next several months, the Company will seek to manage its current level of cash and cash equivalents, through various sources, including but not limited to, reducing operating expenses, possible asset sales and/or long term borrowings, although this cannot be assured.